1 /* $Id: pixel.c,v 1.28 2001/04/10 15:25:45 brianp Exp $ */
4 * Mesa 3-D graphics library
7 * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
42 /**********************************************************************/
43 /***** glPixelZoom *****/
44 /**********************************************************************/
49 _mesa_PixelZoom( GLfloat xfactor
, GLfloat yfactor
)
51 GET_CURRENT_CONTEXT(ctx
);
53 if (ctx
->Pixel
.ZoomX
== xfactor
&&
54 ctx
->Pixel
.ZoomY
== yfactor
)
57 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
58 ctx
->Pixel
.ZoomX
= xfactor
;
59 ctx
->Pixel
.ZoomY
= yfactor
;
64 /**********************************************************************/
65 /***** glPixelStore *****/
66 /**********************************************************************/
70 _mesa_PixelStorei( GLenum pname
, GLint param
)
72 /* NOTE: this call can't be compiled into the display list */
73 GET_CURRENT_CONTEXT(ctx
);
74 ASSERT_OUTSIDE_BEGIN_END(ctx
);
77 case GL_PACK_SWAP_BYTES
:
78 if (param
== (GLint
)ctx
->Pack
.SwapBytes
)
80 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
81 ctx
->Pack
.SwapBytes
= param
? GL_TRUE
: GL_FALSE
;
83 case GL_PACK_LSB_FIRST
:
84 if (param
== (GLint
)ctx
->Pack
.LsbFirst
)
86 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
87 ctx
->Pack
.LsbFirst
= param
? GL_TRUE
: GL_FALSE
;
89 case GL_PACK_ROW_LENGTH
:
91 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelStore(param)" );
94 if (ctx
->Pack
.RowLength
== param
)
96 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
97 ctx
->Pack
.RowLength
= param
;
99 case GL_PACK_IMAGE_HEIGHT
:
101 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelStore(param)" );
104 if (ctx
->Pack
.ImageHeight
== param
)
106 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
107 ctx
->Pack
.ImageHeight
= param
;
109 case GL_PACK_SKIP_PIXELS
:
111 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelStore(param)" );
114 if (ctx
->Pack
.SkipPixels
== param
)
116 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
117 ctx
->Pack
.SkipPixels
= param
;
119 case GL_PACK_SKIP_ROWS
:
121 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelStore(param)" );
124 if (ctx
->Pack
.SkipRows
== param
)
126 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
127 ctx
->Pack
.SkipRows
= param
;
129 case GL_PACK_SKIP_IMAGES
:
131 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelStore(param)" );
134 if (ctx
->Pack
.SkipImages
== param
)
136 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
137 ctx
->Pack
.SkipImages
= param
;
139 case GL_PACK_ALIGNMENT
:
140 if (param
!=1 && param
!=2 && param
!=4 && param
!=8) {
141 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelStore(param)" );
144 if (ctx
->Pack
.Alignment
== param
)
146 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
147 ctx
->Pack
.Alignment
= param
;
149 case GL_UNPACK_SWAP_BYTES
:
150 if (param
== (GLint
)ctx
->Unpack
.SwapBytes
)
152 if ((GLint
)ctx
->Unpack
.SwapBytes
== param
)
154 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
155 ctx
->Unpack
.SwapBytes
= param
? GL_TRUE
: GL_FALSE
;
157 case GL_UNPACK_LSB_FIRST
:
158 if (param
== (GLint
)ctx
->Unpack
.LsbFirst
)
160 if ((GLint
)ctx
->Unpack
.LsbFirst
== param
)
162 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
163 ctx
->Unpack
.LsbFirst
= param
? GL_TRUE
: GL_FALSE
;
165 case GL_UNPACK_ROW_LENGTH
:
167 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelStore(param)" );
170 if (ctx
->Unpack
.RowLength
== param
)
172 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
173 ctx
->Unpack
.RowLength
= param
;
175 case GL_UNPACK_IMAGE_HEIGHT
:
177 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelStore(param)" );
180 if (ctx
->Unpack
.ImageHeight
== param
)
183 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
184 ctx
->Unpack
.ImageHeight
= param
;
186 case GL_UNPACK_SKIP_PIXELS
:
188 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelStore(param)" );
191 if (ctx
->Unpack
.SkipPixels
== param
)
193 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
194 ctx
->Unpack
.SkipPixels
= param
;
196 case GL_UNPACK_SKIP_ROWS
:
198 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelStore(param)" );
201 if (ctx
->Unpack
.SkipRows
== param
)
203 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
204 ctx
->Unpack
.SkipRows
= param
;
206 case GL_UNPACK_SKIP_IMAGES
:
208 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelStore(param)" );
211 if (ctx
->Unpack
.SkipImages
== param
)
213 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
214 ctx
->Unpack
.SkipImages
= param
;
216 case GL_UNPACK_ALIGNMENT
:
217 if (param
!=1 && param
!=2 && param
!=4 && param
!=8) {
218 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelStore" );
221 if (ctx
->Unpack
.Alignment
== param
)
223 FLUSH_VERTICES(ctx
, _NEW_PACKUNPACK
);
224 ctx
->Unpack
.Alignment
= param
;
227 _mesa_error( ctx
, GL_INVALID_ENUM
, "glPixelStore" );
234 _mesa_PixelStoref( GLenum pname
, GLfloat param
)
236 _mesa_PixelStorei( pname
, (GLint
) param
);
241 /**********************************************************************/
242 /***** glPixelMap *****/
243 /**********************************************************************/
248 _mesa_PixelMapfv( GLenum map
, GLint mapsize
, const GLfloat
*values
)
251 GET_CURRENT_CONTEXT(ctx
);
252 ASSERT_OUTSIDE_BEGIN_END(ctx
);
254 if (mapsize
<0 || mapsize
>MAX_PIXEL_MAP_TABLE
) {
255 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelMapfv(mapsize)" );
259 if (map
>=GL_PIXEL_MAP_S_TO_S
&& map
<=GL_PIXEL_MAP_I_TO_A
) {
260 /* test that mapsize is a power of two */
262 GLboolean ok
= GL_FALSE
;
263 for (p
=1; p
<=MAX_PIXEL_MAP_TABLE
; p
=p
<<1) {
264 if ( (p
&mapsize
) == p
) {
270 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPixelMapfv(mapsize)" );
275 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
278 case GL_PIXEL_MAP_S_TO_S
:
279 ctx
->Pixel
.MapStoSsize
= mapsize
;
280 for (i
=0;i
<mapsize
;i
++) {
281 ctx
->Pixel
.MapStoS
[i
] = (GLint
) values
[i
];
284 case GL_PIXEL_MAP_I_TO_I
:
285 ctx
->Pixel
.MapItoIsize
= mapsize
;
286 for (i
=0;i
<mapsize
;i
++) {
287 ctx
->Pixel
.MapItoI
[i
] = (GLint
) values
[i
];
290 case GL_PIXEL_MAP_I_TO_R
:
291 ctx
->Pixel
.MapItoRsize
= mapsize
;
292 for (i
=0;i
<mapsize
;i
++) {
293 GLfloat val
= CLAMP( values
[i
], 0.0, 1.0 );
294 ctx
->Pixel
.MapItoR
[i
] = val
;
295 ctx
->Pixel
.MapItoR8
[i
] = (GLint
) (val
* 255.0F
);
298 case GL_PIXEL_MAP_I_TO_G
:
299 ctx
->Pixel
.MapItoGsize
= mapsize
;
300 for (i
=0;i
<mapsize
;i
++) {
301 GLfloat val
= CLAMP( values
[i
], 0.0, 1.0 );
302 ctx
->Pixel
.MapItoG
[i
] = val
;
303 ctx
->Pixel
.MapItoG8
[i
] = (GLint
) (val
* 255.0F
);
306 case GL_PIXEL_MAP_I_TO_B
:
307 ctx
->Pixel
.MapItoBsize
= mapsize
;
308 for (i
=0;i
<mapsize
;i
++) {
309 GLfloat val
= CLAMP( values
[i
], 0.0, 1.0 );
310 ctx
->Pixel
.MapItoB
[i
] = val
;
311 ctx
->Pixel
.MapItoB8
[i
] = (GLint
) (val
* 255.0F
);
314 case GL_PIXEL_MAP_I_TO_A
:
315 ctx
->Pixel
.MapItoAsize
= mapsize
;
316 for (i
=0;i
<mapsize
;i
++) {
317 GLfloat val
= CLAMP( values
[i
], 0.0, 1.0 );
318 ctx
->Pixel
.MapItoA
[i
] = val
;
319 ctx
->Pixel
.MapItoA8
[i
] = (GLint
) (val
* 255.0F
);
322 case GL_PIXEL_MAP_R_TO_R
:
323 ctx
->Pixel
.MapRtoRsize
= mapsize
;
324 for (i
=0;i
<mapsize
;i
++) {
325 ctx
->Pixel
.MapRtoR
[i
] = CLAMP( values
[i
], 0.0, 1.0 );
328 case GL_PIXEL_MAP_G_TO_G
:
329 ctx
->Pixel
.MapGtoGsize
= mapsize
;
330 for (i
=0;i
<mapsize
;i
++) {
331 ctx
->Pixel
.MapGtoG
[i
] = CLAMP( values
[i
], 0.0, 1.0 );
334 case GL_PIXEL_MAP_B_TO_B
:
335 ctx
->Pixel
.MapBtoBsize
= mapsize
;
336 for (i
=0;i
<mapsize
;i
++) {
337 ctx
->Pixel
.MapBtoB
[i
] = CLAMP( values
[i
], 0.0, 1.0 );
340 case GL_PIXEL_MAP_A_TO_A
:
341 ctx
->Pixel
.MapAtoAsize
= mapsize
;
342 for (i
=0;i
<mapsize
;i
++) {
343 ctx
->Pixel
.MapAtoA
[i
] = CLAMP( values
[i
], 0.0, 1.0 );
347 _mesa_error( ctx
, GL_INVALID_ENUM
, "glPixelMapfv(map)" );
354 _mesa_PixelMapuiv(GLenum map
, GLint mapsize
, const GLuint
*values
)
356 GLfloat fvalues
[MAX_PIXEL_MAP_TABLE
];
358 if (map
==GL_PIXEL_MAP_I_TO_I
|| map
==GL_PIXEL_MAP_S_TO_S
) {
359 for (i
=0;i
<mapsize
;i
++) {
360 fvalues
[i
] = (GLfloat
) values
[i
];
364 for (i
=0;i
<mapsize
;i
++) {
365 fvalues
[i
] = UINT_TO_FLOAT( values
[i
] );
368 _mesa_PixelMapfv(map
, mapsize
, fvalues
);
374 _mesa_PixelMapusv(GLenum map
, GLint mapsize
, const GLushort
*values
)
376 GLfloat fvalues
[MAX_PIXEL_MAP_TABLE
];
378 if (map
==GL_PIXEL_MAP_I_TO_I
|| map
==GL_PIXEL_MAP_S_TO_S
) {
379 for (i
=0;i
<mapsize
;i
++) {
380 fvalues
[i
] = (GLfloat
) values
[i
];
384 for (i
=0;i
<mapsize
;i
++) {
385 fvalues
[i
] = USHORT_TO_FLOAT( values
[i
] );
388 _mesa_PixelMapfv(map
, mapsize
, fvalues
);
394 _mesa_GetPixelMapfv( GLenum map
, GLfloat
*values
)
396 GET_CURRENT_CONTEXT(ctx
);
398 ASSERT_OUTSIDE_BEGIN_END(ctx
);
401 case GL_PIXEL_MAP_I_TO_I
:
402 for (i
=0;i
<ctx
->Pixel
.MapItoIsize
;i
++) {
403 values
[i
] = (GLfloat
) ctx
->Pixel
.MapItoI
[i
];
406 case GL_PIXEL_MAP_S_TO_S
:
407 for (i
=0;i
<ctx
->Pixel
.MapStoSsize
;i
++) {
408 values
[i
] = (GLfloat
) ctx
->Pixel
.MapStoS
[i
];
411 case GL_PIXEL_MAP_I_TO_R
:
412 MEMCPY(values
,ctx
->Pixel
.MapItoR
,ctx
->Pixel
.MapItoRsize
*sizeof(GLfloat
));
414 case GL_PIXEL_MAP_I_TO_G
:
415 MEMCPY(values
,ctx
->Pixel
.MapItoG
,ctx
->Pixel
.MapItoGsize
*sizeof(GLfloat
));
417 case GL_PIXEL_MAP_I_TO_B
:
418 MEMCPY(values
,ctx
->Pixel
.MapItoB
,ctx
->Pixel
.MapItoBsize
*sizeof(GLfloat
));
420 case GL_PIXEL_MAP_I_TO_A
:
421 MEMCPY(values
,ctx
->Pixel
.MapItoA
,ctx
->Pixel
.MapItoAsize
*sizeof(GLfloat
));
423 case GL_PIXEL_MAP_R_TO_R
:
424 MEMCPY(values
,ctx
->Pixel
.MapRtoR
,ctx
->Pixel
.MapRtoRsize
*sizeof(GLfloat
));
426 case GL_PIXEL_MAP_G_TO_G
:
427 MEMCPY(values
,ctx
->Pixel
.MapGtoG
,ctx
->Pixel
.MapGtoGsize
*sizeof(GLfloat
));
429 case GL_PIXEL_MAP_B_TO_B
:
430 MEMCPY(values
,ctx
->Pixel
.MapBtoB
,ctx
->Pixel
.MapBtoBsize
*sizeof(GLfloat
));
432 case GL_PIXEL_MAP_A_TO_A
:
433 MEMCPY(values
,ctx
->Pixel
.MapAtoA
,ctx
->Pixel
.MapAtoAsize
*sizeof(GLfloat
));
436 _mesa_error( ctx
, GL_INVALID_ENUM
, "glGetPixelMapfv" );
442 _mesa_GetPixelMapuiv( GLenum map
, GLuint
*values
)
444 GET_CURRENT_CONTEXT(ctx
);
446 ASSERT_OUTSIDE_BEGIN_END(ctx
);
449 case GL_PIXEL_MAP_I_TO_I
:
450 MEMCPY(values
, ctx
->Pixel
.MapItoI
, ctx
->Pixel
.MapItoIsize
*sizeof(GLint
));
452 case GL_PIXEL_MAP_S_TO_S
:
453 MEMCPY(values
, ctx
->Pixel
.MapStoS
, ctx
->Pixel
.MapStoSsize
*sizeof(GLint
));
455 case GL_PIXEL_MAP_I_TO_R
:
456 for (i
=0;i
<ctx
->Pixel
.MapItoRsize
;i
++) {
457 values
[i
] = FLOAT_TO_UINT( ctx
->Pixel
.MapItoR
[i
] );
460 case GL_PIXEL_MAP_I_TO_G
:
461 for (i
=0;i
<ctx
->Pixel
.MapItoGsize
;i
++) {
462 values
[i
] = FLOAT_TO_UINT( ctx
->Pixel
.MapItoG
[i
] );
465 case GL_PIXEL_MAP_I_TO_B
:
466 for (i
=0;i
<ctx
->Pixel
.MapItoBsize
;i
++) {
467 values
[i
] = FLOAT_TO_UINT( ctx
->Pixel
.MapItoB
[i
] );
470 case GL_PIXEL_MAP_I_TO_A
:
471 for (i
=0;i
<ctx
->Pixel
.MapItoAsize
;i
++) {
472 values
[i
] = FLOAT_TO_UINT( ctx
->Pixel
.MapItoA
[i
] );
475 case GL_PIXEL_MAP_R_TO_R
:
476 for (i
=0;i
<ctx
->Pixel
.MapRtoRsize
;i
++) {
477 values
[i
] = FLOAT_TO_UINT( ctx
->Pixel
.MapRtoR
[i
] );
480 case GL_PIXEL_MAP_G_TO_G
:
481 for (i
=0;i
<ctx
->Pixel
.MapGtoGsize
;i
++) {
482 values
[i
] = FLOAT_TO_UINT( ctx
->Pixel
.MapGtoG
[i
] );
485 case GL_PIXEL_MAP_B_TO_B
:
486 for (i
=0;i
<ctx
->Pixel
.MapBtoBsize
;i
++) {
487 values
[i
] = FLOAT_TO_UINT( ctx
->Pixel
.MapBtoB
[i
] );
490 case GL_PIXEL_MAP_A_TO_A
:
491 for (i
=0;i
<ctx
->Pixel
.MapAtoAsize
;i
++) {
492 values
[i
] = FLOAT_TO_UINT( ctx
->Pixel
.MapAtoA
[i
] );
496 _mesa_error( ctx
, GL_INVALID_ENUM
, "glGetPixelMapfv" );
502 _mesa_GetPixelMapusv( GLenum map
, GLushort
*values
)
504 GET_CURRENT_CONTEXT(ctx
);
506 ASSERT_OUTSIDE_BEGIN_END(ctx
);
509 case GL_PIXEL_MAP_I_TO_I
:
510 for (i
=0;i
<ctx
->Pixel
.MapItoIsize
;i
++) {
511 values
[i
] = (GLushort
) ctx
->Pixel
.MapItoI
[i
];
514 case GL_PIXEL_MAP_S_TO_S
:
515 for (i
=0;i
<ctx
->Pixel
.MapStoSsize
;i
++) {
516 values
[i
] = (GLushort
) ctx
->Pixel
.MapStoS
[i
];
519 case GL_PIXEL_MAP_I_TO_R
:
520 for (i
=0;i
<ctx
->Pixel
.MapItoRsize
;i
++) {
521 values
[i
] = FLOAT_TO_USHORT( ctx
->Pixel
.MapItoR
[i
] );
524 case GL_PIXEL_MAP_I_TO_G
:
525 for (i
=0;i
<ctx
->Pixel
.MapItoGsize
;i
++) {
526 values
[i
] = FLOAT_TO_USHORT( ctx
->Pixel
.MapItoG
[i
] );
529 case GL_PIXEL_MAP_I_TO_B
:
530 for (i
=0;i
<ctx
->Pixel
.MapItoBsize
;i
++) {
531 values
[i
] = FLOAT_TO_USHORT( ctx
->Pixel
.MapItoB
[i
] );
534 case GL_PIXEL_MAP_I_TO_A
:
535 for (i
=0;i
<ctx
->Pixel
.MapItoAsize
;i
++) {
536 values
[i
] = FLOAT_TO_USHORT( ctx
->Pixel
.MapItoA
[i
] );
539 case GL_PIXEL_MAP_R_TO_R
:
540 for (i
=0;i
<ctx
->Pixel
.MapRtoRsize
;i
++) {
541 values
[i
] = FLOAT_TO_USHORT( ctx
->Pixel
.MapRtoR
[i
] );
544 case GL_PIXEL_MAP_G_TO_G
:
545 for (i
=0;i
<ctx
->Pixel
.MapGtoGsize
;i
++) {
546 values
[i
] = FLOAT_TO_USHORT( ctx
->Pixel
.MapGtoG
[i
] );
549 case GL_PIXEL_MAP_B_TO_B
:
550 for (i
=0;i
<ctx
->Pixel
.MapBtoBsize
;i
++) {
551 values
[i
] = FLOAT_TO_USHORT( ctx
->Pixel
.MapBtoB
[i
] );
554 case GL_PIXEL_MAP_A_TO_A
:
555 for (i
=0;i
<ctx
->Pixel
.MapAtoAsize
;i
++) {
556 values
[i
] = FLOAT_TO_USHORT( ctx
->Pixel
.MapAtoA
[i
] );
560 _mesa_error( ctx
, GL_INVALID_ENUM
, "glGetPixelMapfv" );
566 /**********************************************************************/
567 /***** glPixelTransfer *****/
568 /**********************************************************************/
572 * Implements glPixelTransfer[fi] whether called immediately or from a
576 _mesa_PixelTransferf( GLenum pname
, GLfloat param
)
578 GET_CURRENT_CONTEXT(ctx
);
579 ASSERT_OUTSIDE_BEGIN_END(ctx
);
583 if (ctx
->Pixel
.MapColorFlag
== param
? GL_TRUE
: GL_FALSE
)
585 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
586 ctx
->Pixel
.MapColorFlag
= param
? GL_TRUE
: GL_FALSE
;
589 if (ctx
->Pixel
.MapStencilFlag
== param
? GL_TRUE
: GL_FALSE
)
591 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
592 ctx
->Pixel
.MapStencilFlag
= param
? GL_TRUE
: GL_FALSE
;
595 if (ctx
->Pixel
.IndexShift
== (GLint
) param
)
597 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
598 ctx
->Pixel
.IndexShift
= (GLint
) param
;
600 case GL_INDEX_OFFSET
:
601 if (ctx
->Pixel
.IndexOffset
== (GLint
) param
)
603 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
604 ctx
->Pixel
.IndexOffset
= (GLint
) param
;
607 if (ctx
->Pixel
.RedScale
== param
)
609 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
610 ctx
->Pixel
.RedScale
= param
;
613 if (ctx
->Pixel
.RedBias
== param
)
615 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
616 ctx
->Pixel
.RedBias
= param
;
619 if (ctx
->Pixel
.GreenScale
== param
)
621 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
622 ctx
->Pixel
.GreenScale
= param
;
625 if (ctx
->Pixel
.GreenBias
== param
)
627 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
628 ctx
->Pixel
.GreenBias
= param
;
631 if (ctx
->Pixel
.BlueScale
== param
)
633 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
634 ctx
->Pixel
.BlueScale
= param
;
637 if (ctx
->Pixel
.BlueBias
== param
)
639 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
640 ctx
->Pixel
.BlueBias
= param
;
643 if (ctx
->Pixel
.AlphaScale
== param
)
645 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
646 ctx
->Pixel
.AlphaScale
= param
;
649 if (ctx
->Pixel
.AlphaBias
== param
)
651 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
652 ctx
->Pixel
.AlphaBias
= param
;
655 if (ctx
->Pixel
.DepthScale
== param
)
657 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
658 ctx
->Pixel
.DepthScale
= param
;
661 if (ctx
->Pixel
.DepthBias
== param
)
663 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
664 ctx
->Pixel
.DepthBias
= param
;
666 case GL_POST_COLOR_MATRIX_RED_SCALE
:
667 if (ctx
->Pixel
.PostColorMatrixScale
[0] == param
)
669 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
670 ctx
->Pixel
.PostColorMatrixScale
[0] = param
;
672 case GL_POST_COLOR_MATRIX_RED_BIAS
:
673 if (ctx
->Pixel
.PostColorMatrixBias
[0] == param
)
675 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
676 ctx
->Pixel
.PostColorMatrixBias
[0] = param
;
678 case GL_POST_COLOR_MATRIX_GREEN_SCALE
:
679 if (ctx
->Pixel
.PostColorMatrixScale
[1] == param
)
681 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
682 ctx
->Pixel
.PostColorMatrixScale
[1] = param
;
684 case GL_POST_COLOR_MATRIX_GREEN_BIAS
:
685 if (ctx
->Pixel
.PostColorMatrixBias
[1] == param
)
687 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
688 ctx
->Pixel
.PostColorMatrixBias
[1] = param
;
690 case GL_POST_COLOR_MATRIX_BLUE_SCALE
:
691 if (ctx
->Pixel
.PostColorMatrixScale
[2] == param
)
693 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
694 ctx
->Pixel
.PostColorMatrixScale
[2] = param
;
696 case GL_POST_COLOR_MATRIX_BLUE_BIAS
:
697 if (ctx
->Pixel
.PostColorMatrixBias
[2] == param
)
699 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
700 ctx
->Pixel
.PostColorMatrixBias
[2] = param
;
702 case GL_POST_COLOR_MATRIX_ALPHA_SCALE
:
703 if (ctx
->Pixel
.PostColorMatrixScale
[3] == param
)
705 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
706 ctx
->Pixel
.PostColorMatrixScale
[3] = param
;
708 case GL_POST_COLOR_MATRIX_ALPHA_BIAS
:
709 if (ctx
->Pixel
.PostColorMatrixBias
[3] == param
)
711 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
712 ctx
->Pixel
.PostColorMatrixBias
[3] = param
;
714 case GL_POST_CONVOLUTION_RED_SCALE
:
715 if (ctx
->Pixel
.PostConvolutionScale
[0] == param
)
717 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
718 ctx
->Pixel
.PostConvolutionScale
[0] = param
;
720 case GL_POST_CONVOLUTION_RED_BIAS
:
721 if (ctx
->Pixel
.PostConvolutionBias
[0] == param
)
723 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
724 ctx
->Pixel
.PostConvolutionBias
[0] = param
;
726 case GL_POST_CONVOLUTION_GREEN_SCALE
:
727 if (ctx
->Pixel
.PostConvolutionScale
[1] == param
)
729 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
730 ctx
->Pixel
.PostConvolutionScale
[1] = param
;
732 case GL_POST_CONVOLUTION_GREEN_BIAS
:
733 if (ctx
->Pixel
.PostConvolutionBias
[1] == param
)
735 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
736 ctx
->Pixel
.PostConvolutionBias
[1] = param
;
738 case GL_POST_CONVOLUTION_BLUE_SCALE
:
739 if (ctx
->Pixel
.PostConvolutionScale
[2] == param
)
741 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
742 ctx
->Pixel
.PostConvolutionScale
[2] = param
;
744 case GL_POST_CONVOLUTION_BLUE_BIAS
:
745 if (ctx
->Pixel
.PostConvolutionBias
[2] == param
)
747 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
748 ctx
->Pixel
.PostConvolutionBias
[2] = param
;
750 case GL_POST_CONVOLUTION_ALPHA_SCALE
:
751 if (ctx
->Pixel
.PostConvolutionScale
[2] == param
)
753 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
754 ctx
->Pixel
.PostConvolutionScale
[2] = param
;
756 case GL_POST_CONVOLUTION_ALPHA_BIAS
:
757 if (ctx
->Pixel
.PostConvolutionBias
[2] == param
)
759 FLUSH_VERTICES(ctx
, _NEW_PIXEL
);
760 ctx
->Pixel
.PostConvolutionBias
[2] = param
;
763 _mesa_error( ctx
, GL_INVALID_ENUM
, "glPixelTransfer(pname)" );
770 _mesa_PixelTransferi( GLenum pname
, GLint param
)
772 _mesa_PixelTransferf( pname
, (GLfloat
) param
);
777 /**********************************************************************/
778 /***** Pixel processing functions ******/
779 /**********************************************************************/
783 * Apply scale and bias factors to an array of RGBA pixels.
786 _mesa_scale_and_bias_rgba(const GLcontext
*ctx
, GLuint n
, GLfloat rgba
[][4],
787 GLfloat rScale
, GLfloat gScale
,
788 GLfloat bScale
, GLfloat aScale
,
789 GLfloat rBias
, GLfloat gBias
,
790 GLfloat bBias
, GLfloat aBias
)
792 if (rScale
!= 1.0 || rBias
!= 0.0) {
794 for (i
= 0; i
< n
; i
++) {
795 rgba
[i
][RCOMP
] = rgba
[i
][RCOMP
] * rScale
+ rBias
;
798 if (gScale
!= 1.0 || gBias
!= 0.0) {
800 for (i
= 0; i
< n
; i
++) {
801 rgba
[i
][GCOMP
] = rgba
[i
][GCOMP
] * gScale
+ gBias
;
804 if (bScale
!= 1.0 || bBias
!= 0.0) {
806 for (i
= 0; i
< n
; i
++) {
807 rgba
[i
][BCOMP
] = rgba
[i
][BCOMP
] * bScale
+ bBias
;
810 if (aScale
!= 1.0 || aBias
!= 0.0) {
812 for (i
= 0; i
< n
; i
++) {
813 rgba
[i
][ACOMP
] = rgba
[i
][ACOMP
] * aScale
+ aBias
;
820 * Apply pixel mapping to an array of floating point RGBA pixels.
823 _mesa_map_rgba( const GLcontext
*ctx
, GLuint n
, GLfloat rgba
[][4] )
825 const GLfloat rscale
= ctx
->Pixel
.MapRtoRsize
- 1;
826 const GLfloat gscale
= ctx
->Pixel
.MapGtoGsize
- 1;
827 const GLfloat bscale
= ctx
->Pixel
.MapBtoBsize
- 1;
828 const GLfloat ascale
= ctx
->Pixel
.MapAtoAsize
- 1;
829 const GLfloat
*rMap
= ctx
->Pixel
.MapRtoR
;
830 const GLfloat
*gMap
= ctx
->Pixel
.MapGtoG
;
831 const GLfloat
*bMap
= ctx
->Pixel
.MapBtoB
;
832 const GLfloat
*aMap
= ctx
->Pixel
.MapAtoA
;
835 rgba
[i
][RCOMP
] = rMap
[IROUND(rgba
[i
][RCOMP
] * rscale
)];
836 rgba
[i
][GCOMP
] = gMap
[IROUND(rgba
[i
][GCOMP
] * gscale
)];
837 rgba
[i
][BCOMP
] = bMap
[IROUND(rgba
[i
][BCOMP
] * bscale
)];
838 rgba
[i
][ACOMP
] = aMap
[IROUND(rgba
[i
][ACOMP
] * ascale
)];
844 * Apply the color matrix and post color matrix scaling and biasing.
847 _mesa_transform_rgba(const GLcontext
*ctx
, GLuint n
, GLfloat rgba
[][4])
849 const GLfloat rs
= ctx
->Pixel
.PostColorMatrixScale
[0];
850 const GLfloat rb
= ctx
->Pixel
.PostColorMatrixBias
[0];
851 const GLfloat gs
= ctx
->Pixel
.PostColorMatrixScale
[1];
852 const GLfloat gb
= ctx
->Pixel
.PostColorMatrixBias
[1];
853 const GLfloat bs
= ctx
->Pixel
.PostColorMatrixScale
[2];
854 const GLfloat bb
= ctx
->Pixel
.PostColorMatrixBias
[2];
855 const GLfloat as
= ctx
->Pixel
.PostColorMatrixScale
[3];
856 const GLfloat ab
= ctx
->Pixel
.PostColorMatrixBias
[3];
857 const GLfloat
*m
= ctx
->ColorMatrix
.m
;
859 for (i
= 0; i
< n
; i
++) {
860 const GLfloat r
= rgba
[i
][RCOMP
];
861 const GLfloat g
= rgba
[i
][GCOMP
];
862 const GLfloat b
= rgba
[i
][BCOMP
];
863 const GLfloat a
= rgba
[i
][ACOMP
];
864 rgba
[i
][RCOMP
] = (m
[0] * r
+ m
[4] * g
+ m
[ 8] * b
+ m
[12] * a
) * rs
+ rb
;
865 rgba
[i
][GCOMP
] = (m
[1] * r
+ m
[5] * g
+ m
[ 9] * b
+ m
[13] * a
) * gs
+ gb
;
866 rgba
[i
][BCOMP
] = (m
[2] * r
+ m
[6] * g
+ m
[10] * b
+ m
[14] * a
) * bs
+ bb
;
867 rgba
[i
][ACOMP
] = (m
[3] * r
+ m
[7] * g
+ m
[11] * b
+ m
[15] * a
) * as
+ ab
;
873 * Apply a color table lookup to an array of colors.
876 _mesa_lookup_rgba(const struct gl_color_table
*table
,
877 GLuint n
, GLfloat rgba
[][4])
879 ASSERT(table
->FloatTable
);
880 if (!table
->Table
|| table
->Size
== 0)
883 switch (table
->Format
) {
885 /* replace RGBA with I */
886 if (!table
->FloatTable
) {
887 const GLfloat scale
= (GLfloat
) (table
->Size
- 1);
888 const GLchan
*lut
= (const GLchan
*) table
->Table
;
890 for (i
= 0; i
< n
; i
++) {
891 GLint j
= IROUND(rgba
[i
][RCOMP
] * scale
);
892 GLfloat c
= CHAN_TO_FLOAT(lut
[j
]);
893 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] =
894 rgba
[i
][BCOMP
] = rgba
[i
][ACOMP
] = c
;
899 const GLfloat scale
= (GLfloat
) (table
->Size
- 1);
900 const GLfloat
*lut
= (const GLfloat
*) table
->Table
;
902 for (i
= 0; i
< n
; i
++) {
903 GLint j
= IROUND(rgba
[i
][RCOMP
] * scale
);
905 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] =
906 rgba
[i
][BCOMP
] = rgba
[i
][ACOMP
] = c
;
911 /* replace RGB with L */
912 if (!table
->FloatTable
) {
913 const GLfloat scale
= (GLfloat
) (table
->Size
- 1);
914 const GLchan
*lut
= (const GLchan
*) table
->Table
;
916 for (i
= 0; i
< n
; i
++) {
917 GLint j
= IROUND(rgba
[i
][RCOMP
] * scale
);
918 GLfloat c
= CHAN_TO_FLOAT(lut
[j
]);
919 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = c
;
923 const GLfloat scale
= (GLfloat
) (table
->Size
- 1);
924 const GLfloat
*lut
= (const GLfloat
*) table
->Table
;
926 for (i
= 0; i
< n
; i
++) {
927 GLint j
= IROUND(rgba
[i
][RCOMP
] * scale
);
929 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = c
;
934 /* replace A with A */
935 if (!table
->FloatTable
) {
936 const GLfloat scale
= (GLfloat
) (table
->Size
- 1);
937 const GLchan
*lut
= (const GLchan
*) table
->Table
;
939 for (i
= 0; i
< n
; i
++) {
940 GLint j
= IROUND(rgba
[i
][ACOMP
] * scale
);
941 rgba
[i
][ACOMP
] = CHAN_TO_FLOAT(lut
[j
]);
945 const GLfloat scale
= (GLfloat
) (table
->Size
- 1);
946 const GLfloat
*lut
= (const GLfloat
*) table
->Table
;
948 for (i
= 0; i
< n
; i
++) {
949 GLint j
= IROUND(rgba
[i
][ACOMP
] * scale
);
950 rgba
[i
][ACOMP
] = lut
[j
];
954 case GL_LUMINANCE_ALPHA
:
955 /* replace RGBA with LLLA */
956 if (!table
->FloatTable
) {
957 const GLfloat scale
= (GLfloat
) (table
->Size
- 1);
958 const GLchan
*lut
= (const GLchan
*) table
->Table
;
960 for (i
= 0; i
< n
; i
++) {
961 GLint jL
= IROUND(rgba
[i
][RCOMP
] * scale
);
962 GLint jA
= IROUND(rgba
[i
][ACOMP
] * scale
);
963 GLfloat luminance
= CHAN_TO_FLOAT(lut
[jL
* 2 + 0]);
964 GLfloat alpha
= CHAN_TO_FLOAT(lut
[jA
* 2 + 1]);
965 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = luminance
;
966 rgba
[i
][ACOMP
] = alpha
;;
970 const GLfloat scale
= (GLfloat
) (table
->Size
- 1);
971 const GLfloat
*lut
= (const GLfloat
*) table
->Table
;
973 for (i
= 0; i
< n
; i
++) {
974 GLint jL
= IROUND(rgba
[i
][RCOMP
] * scale
);
975 GLint jA
= IROUND(rgba
[i
][ACOMP
] * scale
);
976 GLfloat luminance
= lut
[jL
* 2 + 0];
977 GLfloat alpha
= lut
[jA
* 2 + 1];
978 rgba
[i
][RCOMP
] = rgba
[i
][GCOMP
] = rgba
[i
][BCOMP
] = luminance
;
979 rgba
[i
][ACOMP
] = alpha
;;
984 /* replace RGB with RGB */
985 if (!table
->FloatTable
) {
986 const GLfloat scale
= (GLfloat
) (table
->Size
- 1);
987 const GLchan
*lut
= (const GLchan
*) table
->Table
;
989 for (i
= 0; i
< n
; i
++) {
990 GLint jR
= IROUND(rgba
[i
][RCOMP
] * scale
);
991 GLint jG
= IROUND(rgba
[i
][GCOMP
] * scale
);
992 GLint jB
= IROUND(rgba
[i
][BCOMP
] * scale
);
993 rgba
[i
][RCOMP
] = CHAN_TO_FLOAT(lut
[jR
* 3 + 0]);
994 rgba
[i
][GCOMP
] = CHAN_TO_FLOAT(lut
[jG
* 3 + 1]);
995 rgba
[i
][BCOMP
] = CHAN_TO_FLOAT(lut
[jB
* 3 + 2]);
999 const GLfloat scale
= (GLfloat
) (table
->Size
- 1);
1000 const GLfloat
*lut
= (const GLfloat
*) table
->Table
;
1002 for (i
= 0; i
< n
; i
++) {
1003 GLint jR
= IROUND(rgba
[i
][RCOMP
] * scale
);
1004 GLint jG
= IROUND(rgba
[i
][GCOMP
] * scale
);
1005 GLint jB
= IROUND(rgba
[i
][BCOMP
] * scale
);
1006 rgba
[i
][RCOMP
] = lut
[jR
* 3 + 0];
1007 rgba
[i
][GCOMP
] = lut
[jG
* 3 + 1];
1008 rgba
[i
][BCOMP
] = lut
[jB
* 3 + 2];
1013 /* replace RGBA with RGBA */
1014 if (!table
->FloatTable
) {
1015 const GLfloat scale
= (GLfloat
) (table
->Size
- 1);
1016 const GLchan
*lut
= (const GLchan
*) table
->Table
;
1018 for (i
= 0; i
< n
; i
++) {
1019 GLint jR
= IROUND(rgba
[i
][RCOMP
] * scale
);
1020 GLint jG
= IROUND(rgba
[i
][GCOMP
] * scale
);
1021 GLint jB
= IROUND(rgba
[i
][BCOMP
] * scale
);
1022 GLint jA
= IROUND(rgba
[i
][ACOMP
] * scale
);
1023 rgba
[i
][RCOMP
] = CHAN_TO_FLOAT(lut
[jR
* 4 + 0]);
1024 rgba
[i
][GCOMP
] = CHAN_TO_FLOAT(lut
[jG
* 4 + 1]);
1025 rgba
[i
][BCOMP
] = CHAN_TO_FLOAT(lut
[jB
* 4 + 2]);
1026 rgba
[i
][ACOMP
] = CHAN_TO_FLOAT(lut
[jA
* 4 + 3]);
1030 const GLfloat scale
= (GLfloat
) (table
->Size
- 1);
1031 const GLfloat
*lut
= (const GLfloat
*) table
->Table
;
1033 for (i
= 0; i
< n
; i
++) {
1034 GLint jR
= IROUND(rgba
[i
][RCOMP
] * scale
);
1035 GLint jG
= IROUND(rgba
[i
][GCOMP
] * scale
);
1036 GLint jB
= IROUND(rgba
[i
][BCOMP
] * scale
);
1037 GLint jA
= IROUND(rgba
[i
][ACOMP
] * scale
);
1038 rgba
[i
][RCOMP
] = lut
[jR
* 4 + 0];
1039 rgba
[i
][GCOMP
] = lut
[jG
* 4 + 1];
1040 rgba
[i
][BCOMP
] = lut
[jB
* 4 + 2];
1041 rgba
[i
][ACOMP
] = lut
[jA
* 4 + 3];
1046 _mesa_problem(NULL
, "Bad format in _mesa_lookup_rgba");
1054 * Apply color index shift and offset to an array of pixels.
1057 _mesa_shift_and_offset_ci( const GLcontext
*ctx
, GLuint n
, GLuint indexes
[] )
1059 GLint shift
= ctx
->Pixel
.IndexShift
;
1060 GLint offset
= ctx
->Pixel
.IndexOffset
;
1064 indexes
[i
] = (indexes
[i
] << shift
) + offset
;
1067 else if (shift
< 0) {
1070 indexes
[i
] = (indexes
[i
] >> shift
) + offset
;
1075 indexes
[i
] = indexes
[i
] + offset
;
1082 * Apply color index mapping to color indexes.
1085 _mesa_map_ci( const GLcontext
*ctx
, GLuint n
, GLuint index
[] )
1087 GLuint mask
= ctx
->Pixel
.MapItoIsize
- 1;
1090 index
[i
] = ctx
->Pixel
.MapItoI
[ index
[i
] & mask
];
1096 * Map color indexes to rgba values.
1099 _mesa_map_ci_to_rgba_chan( const GLcontext
*ctx
, GLuint n
,
1100 const GLuint index
[], GLchan rgba
[][4] )
1103 GLuint rmask
= ctx
->Pixel
.MapItoRsize
- 1;
1104 GLuint gmask
= ctx
->Pixel
.MapItoGsize
- 1;
1105 GLuint bmask
= ctx
->Pixel
.MapItoBsize
- 1;
1106 GLuint amask
= ctx
->Pixel
.MapItoAsize
- 1;
1107 const GLubyte
*rMap
= ctx
->Pixel
.MapItoR8
;
1108 const GLubyte
*gMap
= ctx
->Pixel
.MapItoG8
;
1109 const GLubyte
*bMap
= ctx
->Pixel
.MapItoB8
;
1110 const GLubyte
*aMap
= ctx
->Pixel
.MapItoA8
;
1113 rgba
[i
][RCOMP
] = rMap
[index
[i
] & rmask
];
1114 rgba
[i
][GCOMP
] = gMap
[index
[i
] & gmask
];
1115 rgba
[i
][BCOMP
] = bMap
[index
[i
] & bmask
];
1116 rgba
[i
][ACOMP
] = aMap
[index
[i
] & amask
];
1119 GLuint rmask
= ctx
->Pixel
.MapItoRsize
- 1;
1120 GLuint gmask
= ctx
->Pixel
.MapItoGsize
- 1;
1121 GLuint bmask
= ctx
->Pixel
.MapItoBsize
- 1;
1122 GLuint amask
= ctx
->Pixel
.MapItoAsize
- 1;
1123 const GLfloat
*rMap
= ctx
->Pixel
.MapItoR
;
1124 const GLfloat
*gMap
= ctx
->Pixel
.MapItoG
;
1125 const GLfloat
*bMap
= ctx
->Pixel
.MapItoB
;
1126 const GLfloat
*aMap
= ctx
->Pixel
.MapItoA
;
1129 CLAMPED_FLOAT_TO_CHAN(rgba
[i
][RCOMP
], rMap
[index
[i
] & rmask
]);
1130 CLAMPED_FLOAT_TO_CHAN(rgba
[i
][GCOMP
], gMap
[index
[i
] & gmask
]);
1131 CLAMPED_FLOAT_TO_CHAN(rgba
[i
][BCOMP
], bMap
[index
[i
] & bmask
]);
1132 CLAMPED_FLOAT_TO_CHAN(rgba
[i
][ACOMP
], aMap
[index
[i
] & amask
]);
1139 * Map color indexes to float rgba values.
1142 _mesa_map_ci_to_rgba( const GLcontext
*ctx
, GLuint n
,
1143 const GLuint index
[], GLfloat rgba
[][4] )
1145 GLuint rmask
= ctx
->Pixel
.MapItoRsize
- 1;
1146 GLuint gmask
= ctx
->Pixel
.MapItoGsize
- 1;
1147 GLuint bmask
= ctx
->Pixel
.MapItoBsize
- 1;
1148 GLuint amask
= ctx
->Pixel
.MapItoAsize
- 1;
1149 const GLfloat
*rMap
= ctx
->Pixel
.MapItoR
;
1150 const GLfloat
*gMap
= ctx
->Pixel
.MapItoG
;
1151 const GLfloat
*bMap
= ctx
->Pixel
.MapItoB
;
1152 const GLfloat
*aMap
= ctx
->Pixel
.MapItoA
;
1155 rgba
[i
][RCOMP
] = rMap
[index
[i
] & rmask
];
1156 rgba
[i
][GCOMP
] = gMap
[index
[i
] & gmask
];
1157 rgba
[i
][BCOMP
] = bMap
[index
[i
] & bmask
];
1158 rgba
[i
][ACOMP
] = aMap
[index
[i
] & amask
];
1164 * Map 8-bit color indexes to rgb values.
1167 _mesa_map_ci8_to_rgba( const GLcontext
*ctx
, GLuint n
, const GLubyte index
[],
1171 GLuint rmask
= ctx
->Pixel
.MapItoRsize
- 1;
1172 GLuint gmask
= ctx
->Pixel
.MapItoGsize
- 1;
1173 GLuint bmask
= ctx
->Pixel
.MapItoBsize
- 1;
1174 GLuint amask
= ctx
->Pixel
.MapItoAsize
- 1;
1175 const GLubyte
*rMap
= ctx
->Pixel
.MapItoR8
;
1176 const GLubyte
*gMap
= ctx
->Pixel
.MapItoG8
;
1177 const GLubyte
*bMap
= ctx
->Pixel
.MapItoB8
;
1178 const GLubyte
*aMap
= ctx
->Pixel
.MapItoA8
;
1181 rgba
[i
][RCOMP
] = rMap
[index
[i
] & rmask
];
1182 rgba
[i
][GCOMP
] = gMap
[index
[i
] & gmask
];
1183 rgba
[i
][BCOMP
] = bMap
[index
[i
] & bmask
];
1184 rgba
[i
][ACOMP
] = aMap
[index
[i
] & amask
];
1187 GLuint rmask
= ctx
->Pixel
.MapItoRsize
- 1;
1188 GLuint gmask
= ctx
->Pixel
.MapItoGsize
- 1;
1189 GLuint bmask
= ctx
->Pixel
.MapItoBsize
- 1;
1190 GLuint amask
= ctx
->Pixel
.MapItoAsize
- 1;
1191 const GLfloat
*rMap
= ctx
->Pixel
.MapItoR
;
1192 const GLfloat
*gMap
= ctx
->Pixel
.MapItoG
;
1193 const GLfloat
*bMap
= ctx
->Pixel
.MapItoB
;
1194 const GLfloat
*aMap
= ctx
->Pixel
.MapItoA
;
1197 CLAMPED_FLOAT_TO_CHAN(rgba
[i
][RCOMP
], rMap
[index
[i
] & rmask
]);
1198 CLAMPED_FLOAT_TO_CHAN(rgba
[i
][GCOMP
], gMap
[index
[i
] & gmask
]);
1199 CLAMPED_FLOAT_TO_CHAN(rgba
[i
][BCOMP
], bMap
[index
[i
] & bmask
]);
1200 CLAMPED_FLOAT_TO_CHAN(rgba
[i
][ACOMP
], aMap
[index
[i
] & amask
]);
1207 _mesa_shift_and_offset_stencil( const GLcontext
*ctx
, GLuint n
,
1208 GLstencil stencil
[] )
1211 GLint shift
= ctx
->Pixel
.IndexShift
;
1212 GLint offset
= ctx
->Pixel
.IndexOffset
;
1215 stencil
[i
] = (stencil
[i
] << shift
) + offset
;
1218 else if (shift
< 0) {
1221 stencil
[i
] = (stencil
[i
] >> shift
) + offset
;
1226 stencil
[i
] = stencil
[i
] + offset
;
1234 _mesa_map_stencil( const GLcontext
*ctx
, GLuint n
, GLstencil stencil
[] )
1236 GLuint mask
= ctx
->Pixel
.MapStoSsize
- 1;
1239 stencil
[i
] = ctx
->Pixel
.MapStoS
[ stencil
[i
] & mask
];
1246 * This function converts an array of GLchan colors to GLfloat colors.
1247 * Most importantly, it undoes the non-uniform quantization of pixel
1248 * values introduced when we convert shallow (< 8 bit) pixel values
1249 * to GLubytes in the ctx->Driver.ReadRGBASpan() functions.
1250 * This fixes a number of OpenGL conformance failures when running on
1251 * 16bpp displays, for example.
1254 _mesa_chan_to_float_span(const GLcontext
*ctx
, GLuint n
,
1255 CONST GLchan rgba
[][4], GLfloat rgbaf
[][4])
1257 const GLuint rShift
= CHAN_BITS
- ctx
->Visual
.redBits
;
1258 const GLuint gShift
= CHAN_BITS
- ctx
->Visual
.greenBits
;
1259 const GLuint bShift
= CHAN_BITS
- ctx
->Visual
.blueBits
;
1261 const GLfloat rScale
= 1.0 / (GLfloat
) ((1 << ctx
->Visual
.redBits
) - 1);
1262 const GLfloat gScale
= 1.0 / (GLfloat
) ((1 << ctx
->Visual
.greenBits
) - 1);
1263 const GLfloat bScale
= 1.0 / (GLfloat
) ((1 << ctx
->Visual
.blueBits
) - 1);
1267 if (ctx
->Visual
.alphaBits
> 0) {
1268 aShift
= CHAN_BITS
- ctx
->Visual
.alphaBits
;
1269 aScale
= 1.0 / (GLfloat
) ((1 << ctx
->Visual
.alphaBits
) - 1);
1273 aScale
= 1.0F
/ CHAN_MAXF
;
1276 for (i
= 0; i
< n
; i
++) {
1277 const GLint r
= rgba
[i
][RCOMP
] >> rShift
;
1278 const GLint g
= rgba
[i
][GCOMP
] >> gShift
;
1279 const GLint b
= rgba
[i
][BCOMP
] >> bShift
;
1280 const GLint a
= rgba
[i
][ACOMP
] >> aShift
;
1281 rgbaf
[i
][RCOMP
] = (GLfloat
) r
* rScale
;
1282 rgbaf
[i
][GCOMP
] = (GLfloat
) g
* gScale
;
1283 rgbaf
[i
][BCOMP
] = (GLfloat
) b
* bScale
;
1284 rgbaf
[i
][ACOMP
] = (GLfloat
) a
* aScale
;